Filament by-pass condenser



July 13, R, M PAGE ET AL 2,445,256

FILAMENT BYPAS S CONDENSER Filed Aug. 25, 1942 2 Sheets-Sheet 1 l-l- L1v1/uvm Robert M. page Merril E Dstad July 13, 1948- R. M. PAGE ET Al.2,445,256

FILAMENT BYPASS CONDENSER Filed Aug. 25, 1942 2 Sheets-Sheet 2 Eli-:1E

SWW/whew Robert,A M. Page Merril, E Disad Patented July 13, 1948FILAMENT BY-PASS CONDENSER Robert M. Page, Washington, D. o., and MerrilF. Distad, Cheverly, Md.

Application August 25, 1942, Serial No. 456,044

(Cl. Z50- 16) (Granted under the act of March 3, 1883, as amended April30, 1928; 370 O. G. 757) 6 Claims.

This invention relates to a filament bypass condenser assemblyespecially suited for use with high voltage -oscillator tubes mounted ina ring.

Under circtunstances which require the generation of pulses of highfrequency oscillations at high power levels it has been foundadvantageous to employ a number of oscillator tubes in a ring mountingusing iilament frames for coupling to a concentric transmission linewhich couples in turn to 'the antenna. Such a construction is disclosedin the application oi R. M. Page etal., Ser. No. 456,045, filed August25, 1942, for Oscillators.

With such a construction it is desirable to employ the filament framesas conduits for the filament leads and to provide a compact ruggedbypass condenser assembly between the filament leads and between theleads and the ends of the frames adjacent the oscillator tubes. It is anobject of -this invention to provide a bypass condenser meeting -theabove requirements.

It is a further object of this invention to pro- Vide a bypass condenserassembly which will constitute a unita-ry compact rigid assemblyproviding bypass capacity between the two lament leads and an oscillatortube and between each of said leads and the filament frame associatedtherewith.

It is another object of this invention to provide such an assembly whichwill also act as a supporting and mounting means for the oscillator tubeassociated therewith.

It is still another object of this invention to provide such an assemblywhich will act as a rigid mechanical connecting means between anoscillator tube and a lament frame associated therewith.

It is a still further object of this invention to provide such anassembly which will possess a shape adapting it for incorporation `intoa ring mounted multiple tube oscillator intended for operation at highvoltages. It is still another object of this invention to provide suchassembly which, when incorporated into a ringmounted multiple tubeoscillator, will lend itself readily to tuning by a butterfly typetuning means common .to all the assemblies in the oscillator.

Other objects of the invention will become apparent from a carefulconsideration of the following description when taken together with theaccompanying drawings in which:

Fig. l is an elevational view taken partly in section along the line I-Iof Fig.2 showing thev 2 :bypass condenser assembly embodying theinvention;

Fig. 2 is `a .plan view of the assembly at Fig. 1;

Fig. 3 is a plan view of one of .the intermediate ycondenser plates ofthe assembly;

Fig. 4 is a cross-sectional view of the assembly shown in Fig. 2 takenalong the line 'I-1;

Fig. 5 is an elevational view taken partly in section along the line 5-5of Fig. 6 showing a second embodiment of the invention;

Fig. 6 is a plan view of the assembly shown in Fig. 5, and

Fig. '7 is a ,plan View of a portion of a ring mounted multiple tubeoscillator unit showing four of the condenser assemblies as they wouldbe mounted in such a unit and showing a buttery type tuning vanepositioned for use therewith.

Referring now to the embodiment of the invention shown in Figs. 1 to 4,reference character I0 indicates a tubular filament frame adapted foruse as a coupling means between the lament of an oscillator tube of aring mounted multiple tube oscillator and a transmission line coupled toan antenna. The employment of a lament frame for this purpose isdisclosed in the above mentioned application of Page et al. Soldered orwelded inside the upper end of the filament frame and ilush therewith isa conducting disk I I. The -condenser assembly proper is comprised of anupper condenser lplate I 2 anda lower condenser plate I3 havingidentic-al configuration which is more readily seen in Fig. 2. Theseplates form a portion of a stacked condenser which includes twointermediate plates I4 and I5, all the plates being separated one fromthe other by disks of dielectric material indicated at I6, I'I and I8.The condenser plates I4 and I5 and the dielectric disks I6, I1 and I8are circular in shape as indicated in Fig. 3, the disks of dielectricmaterial being suciently larger in diameter than the circular condenserplates to aioi'd protection against flashover lat high voltages. Forthis purpos-e `also the edges of the condenser plates are rounded. Thecondenser when assembled in an oscillator is usually mounted on adisc-like supporting member of insulating material such as indicated atI9. The condenser rests on top of this disc and the lament frame I0extends downwardly through a hole bored for that purpose. The condenseris bound tightly together and rigidly held on the disc I9 by means of apair of bolts 2l) which are tapped into the lower plate I3. Thecondenser is rigidly mounted on the lament frame I0 with the axis of theframe extending normal to the lateral surfaces oi the `from to avoidilashover.

.tor 2li for the same purpose.

condenser plates by means of a screw-headed bolt 2I extending throughboth upper and lower condenser plates and being tapped into disk Il. Thehead of this bolt is counter-sunk into the plate I2 to avoid .projectingpoints or ridges. A spacing cylinder 22, preferably Iof a dielectricmaterial surrounds the bolt 2|.

The oscillator tube associated with this condenser assembly is intendedto be mounted directly on the assembly and to be supported at leastpartially thereby. Such tubes areprovided with a pair of downwardlydirected filament terminals such as shown in Fig. 1 at 23'and 42li.These terminals are received in a pair of pin vise connectors 25 and 26which arein turn conductively attached to a pair of downwardly extendinglugs 21 and 23, the lug 21 having a tapped connection to the condenserplate I4 and the lug28 having a similar connection tocondenser plate l5.These lugs extend downwardly through the supporting plate I9 andterminate below it in terminal posts 2S and 3D to which the ends oi.filament leads SI and 32 are secured. Aiter leaving the termina-l poststhe |leads .3l and 32 enter the filament frame IQ through a hole formed`near theupper end thereof andcontinue downwardly throughout its length.

The top condenser plate I2 of the stack has a .cutaway portion indicatedat'll surrounding the pin vise connectors and spaced far enoughthererlhe condenser plate i4 is also provided with a cut-out portion lisurrounding the location of the'pin vise connec- -Where the lugs 2land-28 pass through condenser platesfrom which they are required to beinsulated, insulating washers such as that indicated at l2 areprovided.In all cases the disks oi dielectric material posi- .tioned between thecondenser plates are ex- `respectively, which portions terminate inthose condense` "lates, The filament leadsSI and 32 soldered to thecondenser plates Iii and I5' respectively as indicated at ill and t5and-then passed through a hole d5 iormed in the lower vcondenser,plateand located above the upper end of the filament frame l. The lamentleads then continue downwardly through .the illament Aframe as before.

In ythis form of the invention the condenser .assembly is attached tothe filament frame by means oi .the screw-headed bolt 2/I which istapped into a block i soldered or welded .into the top of thefilamenti-rame l which block is of a size toiallow the leads 3| `and 32to pass-by itintofthe frame. The spacer member 22 is semi cylindrical inform for ythe same purpose. The condenser stack is secured into a unitand se- .curely held to the insulating supporting disk 'it yby bolts 2Gas before.

Fig. 1i shows'a cross-section of `the condenser assembly'talen along theline l-l of Eig..2'but which could equally well have been taken from acondenser assembly of the type shown in Figs. 5 and 6. This viewindicatesthe manner in which the -bolts 20 are lead through .the `top.and bottom ttrude.

. assemblies.

'central hole indicated at 48 over which the tapered ends of thecondenser assemblies pro- The amount of protrusion is suicient so thatthe filament frames attached to each of the 'assemblies may passdownwardly through a hole sufliciently removed from its edge to preventlashoven 'Centrally positioned about the hole is a butterfly tuning vane50 having four identical armseachunderlying an-identical portion of thevtop .condenser plate I2 of one of the condenser Movement of the tuningvane 50 about its axis 5I thus simultaneously tunes all the assemblies.

It willbe seen that applicants have contributed to lthe art a condenserassembly which is admirably yadapted to use in multiple tube ringmounted oscillators employing lament frames for coupling purposes andwhich possesses a number of outstandingadvantages for this use. Theframe -is compact and rugged, amply protected fromsflashover at highvoltages, provldessupport for an electronic tube, lends itself to firmconnection to a filamentframe and to gang tuning by means of Aabutterfly type tuning vane and, by virtue of its coniiguration, isadapted to the multiplemountingof oscillator tubes in the minimum amount.of space.

It should be understood that the practice of the invention is notlimited to the embodiments illustrated anddescribed but is circumscribedonly by the scope and limitations-'of the appended claims.

The invention described herein may be manu-- factured and used by or forthe Government of the United States-of America `for governmentalpurposes without the payment of Aany royalties thereon or therefor.

We claim:

l. In combination, apairof conductors consti- .tuting'thelament leads ofan oscillator tube, a tubular conducting member surrounding saidconductors for a portion of their length and insulated therefrom, saidconducting member forming transmission means for coupling the radioirequencyoutput'of` said-tube to an antenna feed line, and means forminga radio frequency bypass between said conductors and between each ofsaid conductors and saidconductingmember, saidmeans comprising a stackof four condenser plates, dielectric material separating said plates,means rigidly and conductively connecting the two outermost of saidplates to one end of said conducting member, means conductivelyconnecting each of said conductors to a separate one oftheintermediateplates of said stack, and means insulating each of saidconductors from the remainder of'said plates.

2. In combination for'use in a multiple tube oscillator, a pair ofconductors constituting the being insulated therefrom and means forminga radio frequency bypass between said conductors and between each ofsaid conductors and said conducting member, said means comprising astack of four condenser plates, dielectric material separating saidplatesmeans rigidly and conductively connecting the two outermost ofsaid plates together and to one end of said conducting member to form aunitary assembly with the axis of said conducting member extendingnormal to the lateral surfaces of said plates, said conductors extendinginto said stack in parallelism to said axis, means rigidly andconductively connecting each of said conductors to a separate one of theintermediate plates of said stack, and means insulating each of saidconductors from the remainder of said plates.

3. A condenser constituting a rigid mechanical interconnection betweenan electronic tube and a filament frame encasing the lament leads ofsaid tube for a portion of their length, said condenser serving as arigid mounting and supporting means for said tube and providing a radiofrequency bypass means between said filament leads and between each ofsaid leads and said frame, said condenser comprising a stack of fourcondenser plates, dielectric means separating said plates, means bindingsaid stack into a unitary assembly, means rigidly and conductivelyconnecting the two outermost of said plates together and to one end ofsaid frame with the axis of said frame extending substantially normal tothe lateral surface of said condenser plates, means rigidly connectingeach of the filament terminals of said tube to a separate one of theintermediate plates of said stack, and means connecting each of saidiilament leads to a separate one of said intermediate plates.

4. A condenser comprising a stack of condenser plates, dielectric meansseparating said plates, the intermediate ones of said plates beingsymmetrically shaped, the two outermost of said plates each having aportion of similar shape to that of said intermediate plates and being4formed with a co-planar tongue-like portion extending rigidlytherefrom, means clamping said stack together into a unitary assembly, aplurality of rigid conductors extending through said stack in mutualparallelism, means conductively connecting each of said conductors to aseparate one of said intermediate plates, means insulating saidconductors from the remainder of said condenser said conductors havingmeans formed at their exposed ends to receive and rigidly hold theterminal pins of an electronic tube, and means conductively and rigidlyconnecting said tongue-like portions of said outermost plates.

5. A condenser comprising a stack of condenser plates, dielectric meansseparating said plates, the intermediate ones of said plates beingsymmetrically shaped, the two outermost of said plates each having aportion of similar shape to that of said intermediate plates and beingformed with a co-planar tongue-like portion extending rigidly therefrom,means clamping said stack together into a unitary assembly, a pluralityof conducting rods extending through said stack in mutual parallelism,each of said rods being tapped into one of said intermediate plates,means insulating said rods from the remainder of said condenser,terminal connection means formed on both ends of each of said rods, theterminal connection means at an adjacent end of each of said rods beingformed to receive and rigidly hold the terminal pins of an electronictube whereby said condenser rigidly supports said tube on an axis normalto the lateral surface of said condenser plates, and means conductivelyand rigidly connecting said tongue-like portions of said outermostplates.

6. A condenser comprising a stack of condenser plates, dielectric meansseparating said plates, the intermediate ones of said plates beingsymmetrically shaped, the two outermost of said plates each having aportion of similar shape to that of said intermediate plates and beingformed with a co-planar tongue-like portion extending rigidly therefrom,means clamping said stack together into a unitary assembly, a terminalconnection means formed on each of said intermediate plates andextending outwardly therefrom through said stack, said connection meansbeing insulated from the remainder of said condenser said connectionmeans being so formed as to receiVe and rigidly hold the terminal pinsof an electronic tube, whereby said condenser rigidly supports said tubeon an axis normal to the lateral surface of said condenser plates, andmeans conductively and rigidly connecting said tonguelike portions oisaid outermost plates.

ROBERT M. PAGE. MERRIL F. DISTAD.

REFERENCE S CIT ED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,588,438 Bliss June 15, 19262,205,852 Hollmann June 25, 1940 2,216,176 Hollmann Oct. 1, 1940

